WordNet sense 1 (not elegant or graceful in expression):

awkward, clumsy, cumbersome, inapt, ill-chosen

WordNet sense 2 (generally incompetent and ineffectual):

feckless

WordNet sense 3 (not qualified or suited for a purpose):

incompetent

WordNet sense 4 (revealing lack of perceptiveness or judgment or finesse):

tactless

WordNet sense 5 (not adroit):

maladroit